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Kernel: Use KResult a bit more in sys$execve()

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This commit is contained in:
Andreas Kling 2021-02-18 08:51:06 +01:00
parent edec5e29a3
commit 55a9a4f57a
Notes: sideshowbarker 2024-07-18 22:09:47 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/55a9a4f57a5
2 changed files with 28 additions and 33 deletions
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4
Kernel/Process.h
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@ -387,7 +387,7 @@ public:
return m_max_open_file_descriptors;
}
int exec(String path, Vector<String> arguments, Vector<String> environment, int recusion_depth = 0);
KResult exec(String path, Vector<String> arguments, Vector<String> environment, int recusion_depth = 0);
KResultOr<LoadResult> load(NonnullRefPtr<FileDescription> main_program_description, RefPtr<FileDescription> interpreter_description, const Elf32_Ehdr& main_program_header);
@ -477,7 +477,7 @@ private:
bool dump_core();
bool dump_perfcore();
int do_exec(NonnullRefPtr<FileDescription> main_program_description, Vector<String> arguments, Vector<String> environment, RefPtr<FileDescription> interpreter_description, Thread*& new_main_thread, u32& prev_flags, const Elf32_Ehdr& main_program_header);
KResult do_exec(NonnullRefPtr<FileDescription> main_program_description, Vector<String> arguments, Vector<String> environment, RefPtr<FileDescription> interpreter_description, Thread*& new_main_thread, u32& prev_flags, const Elf32_Ehdr& main_program_header);
ssize_t do_write(FileDescription&, const UserOrKernelBuffer&, size_t);
KResultOr<RefPtr<FileDescription>> find_elf_interpreter_for_executable(const String& path, const Elf32_Ehdr& elf_header, int nread, size_t file_size);

57
Kernel/Syscalls/execve.cpp
View file

@ -461,35 +461,34 @@ KResultOr<LoadResult> Process::load(NonnullRefPtr<FileDescription> main_program_
return interpreter_load_result;
}
int Process::do_exec(NonnullRefPtr<FileDescription> main_program_description, Vector<String> arguments, Vector<String> environment, RefPtr<FileDescription> interpreter_description, Thread*& new_main_thread, u32& prev_flags, const Elf32_Ehdr& main_program_header)
KResult Process::do_exec(NonnullRefPtr<FileDescription> main_program_description, Vector<String> arguments, Vector<String> environment, RefPtr<FileDescription> interpreter_description, Thread*& new_main_thread, u32& prev_flags, const Elf32_Ehdr& main_program_header)
{
ASSERT(is_user_process());
ASSERT(!Processor::current().in_critical());
auto path = main_program_description->absolute_path();
#if EXEC_DEBUG
dbgln("do_exec({})", path);
#endif
dbgln_if(EXEC_DEBUG, "do_exec: {}", path);
// FIXME: How much stack space does process startup need?
if (!validate_stack_size(arguments, environment))
return -E2BIG;
return E2BIG;
auto parts = path.split('/');
if (parts.is_empty())
return -ENOENT;
return ENOENT;
auto main_program_metadata = main_program_description->metadata();
auto load_result_or_error = load(main_program_description, interpreter_description, main_program_header);
if (load_result_or_error.is_error()) {
dbgln("do_exec({}): Failed to load main program or interpreter", path);
dbgln("do_exec: Failed to load main program or interpreter for {}", path);
return load_result_or_error.error();
}
auto signal_trampoline_range = load_result_or_error.value().space->allocate_range({}, PAGE_SIZE);
if (!signal_trampoline_range.has_value()) {
dbgln("do_exec: Failed to allocate VM for signal trampoline");
return -ENOMEM;
return ENOMEM;
}
// We commit to the new executable at this point. There is no turning back!
@ -631,7 +630,7 @@ int Process::do_exec(NonnullRefPtr<FileDescription> main_program_description, Ve
[[maybe_unused]] auto rc = big_lock().force_unlock_if_locked(lock_count_to_restore);
ASSERT_INTERRUPTS_DISABLED();
ASSERT(Processor::current().in_critical());
return 0;
return KSuccess;
}
static Vector<ELF::AuxiliaryValue> generate_auxiliary_vector(FlatPtr load_base, FlatPtr entry_eip, uid_t uid, uid_t euid, gid_t gid, gid_t egid, String executable_path, int main_program_fd)
@ -718,10 +717,7 @@ KResultOr<RefPtr<FileDescription>> Process::find_elf_interpreter_for_executable(
}
if (!interpreter_path.is_empty()) {
#if EXEC_DEBUG
dbgln("exec({}): Using program interpreter {}", path, interpreter_path);
#endif
dbgln_if(EXEC_DEBUG, "exec({}): Using program interpreter {}", path, interpreter_path);
auto interp_result = VFS::the().open(interpreter_path, O_EXEC, 0, current_directory());
if (interp_result.is_error()) {
dbgln("exec({}): Unable to open program interpreter {}", path, interpreter_path);
@ -784,11 +780,11 @@ KResultOr<RefPtr<FileDescription>> Process::find_elf_interpreter_for_executable(
return KResult(KSuccess);
}
int Process::exec(String path, Vector<String> arguments, Vector<String> environment, int recursion_depth)
KResult Process::exec(String path, Vector<String> arguments, Vector<String> environment, int recursion_depth)
{
if (recursion_depth > 2) {
dbgln("exec({}): SHENANIGANS! recursed too far trying to find #! interpreter", path);
return -ELOOP;
return ELOOP;
}
// Open the file to check what kind of binary format it is
@ -798,15 +794,15 @@ int Process::exec(String path, Vector<String> arguments, Vector<String> environm
// * ET_EXEC binary that just gets loaded
// * ET_DYN binary that requires a program interpreter
//
auto result = VFS::the().open(path, O_EXEC, 0, current_directory());
if (result.is_error())
return result.error();
auto description = result.release_value();
auto file_or_error = VFS::the().open(path, O_EXEC, 0, current_directory());
if (file_or_error.is_error())
return file_or_error.error();
auto description = file_or_error.release_value();
auto metadata = description->metadata();
// Always gonna need at least 3 bytes. these are for #!X
if (metadata.size < 3)
return -ENOEXEC;
return ENOEXEC;
ASSERT(description->inode());
@ -815,7 +811,7 @@ int Process::exec(String path, Vector<String> arguments, Vector<String> environm
auto first_page_buffer = UserOrKernelBuffer::for_kernel_buffer((u8*)&first_page);
auto nread_or_error = description->read(first_page_buffer, sizeof(first_page));
if (nread_or_error.is_error())
return -ENOEXEC;
return ENOEXEC;
// 1) #! interpreted file
auto shebang_result = find_shebang_interpreter_for_executable(first_page, nread_or_error.value());
@ -833,12 +829,12 @@ int Process::exec(String path, Vector<String> arguments, Vector<String> environm
// #2) ELF32 for i386
if (nread_or_error.value() < (int)sizeof(Elf32_Ehdr))
return -ENOEXEC;
return ENOEXEC;
auto main_program_header = (Elf32_Ehdr*)first_page;
if (!ELF::validate_elf_header(*main_program_header, metadata.size)) {
dbgln("exec({}): File has invalid ELF header", path);
return -ENOEXEC;
return ENOEXEC;
}
auto elf_result = find_elf_interpreter_for_executable(path, *main_program_header, nread_or_error.value(), metadata.size);
@ -855,10 +851,9 @@ int Process::exec(String path, Vector<String> arguments, Vector<String> environm
// are cleaned up by the time we yield-teleport below.
Thread* new_main_thread = nullptr;
u32 prev_flags = 0;
int rc = do_exec(move(description), move(arguments), move(environment), move(interpreter_description), new_main_thread, prev_flags, *main_program_header);
if (rc < 0)
return rc;
auto result = do_exec(move(description), move(arguments), move(environment), move(interpreter_description), new_main_thread, prev_flags, *main_program_header);
if (result.is_error())
return result;
ASSERT_INTERRUPTS_DISABLED();
ASSERT(Processor::current().in_critical());
@ -877,7 +872,7 @@ int Process::exec(String path, Vector<String> arguments, Vector<String> environm
}
Processor::current().leave_critical(prev_flags);
return 0;
return KSuccess;
}
int Process::sys$execve(Userspace<const Syscall::SC_execve_params*> user_params)
@ -929,9 +924,9 @@ int Process::sys$execve(Userspace<const Syscall::SC_execve_params*> user_params)
if (!copy_user_strings(params.environment, environment))
return -EFAULT;
int rc = exec(move(path), move(arguments), move(environment));
ASSERT(rc < 0); // We should never continue after a successful exec!
return rc;
auto result = exec(move(path), move(arguments), move(environment));
ASSERT(result.is_error()); // We should never continue after a successful exec!
return result.error();
}
}